Anti-cystatin like 1 antibodies are used in the immunodetection of the protein encoded by the CSTL1 gene. In humans, the canonical protein has a reported length of 145 amino acid residues and a mass of 17 kDa. It is known to be a secreted protein. The cystatin like 1 protein is a member of the Cystatin protein family. Post-translational modifications have been described, including glycosylation.